Update deepseq submodule to latest 1.4.2.0 snapshot
Update deepseq submodule to latest 1.4.2.0 snapshot

NB: this needs 91ee5090f1e3f43e9e803cf7005a7f3357e58377
(cherry picked from commit 96e1bb4536a6f130c9242e3c25566c7d2e71ee97)

GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc